Water-tube connection



R. H. WILHELM 1,719,155 H WATER TUBE CONNECTION Filed July 15. 1926 Patented July 2, 1929. UNITED STATES RUSSELL H.

VVILHELM, OF EASTON, PENNSYLVANIA, ASSIGNOB T0 INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A GORIOBATION OF NEW JERSEY.

. WATER-TUBE Application filed July 15,

This invention relates to rock drills, but more particularly to a water tube connectlon for that type of rock drills in which water is supplied to a hollow drill steel for cleans ing the drill hole.

he objects of this invention are to seal the water tube in the back headso as to prevent water from being forced into the cylinder, to protect the water tube against injury by the securing means and to prevent improper as sembly of the parts comprising the connection.

Other obj ects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of elements and arrangement ofparts substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which t Figure 1 is an elevationof a rock drill partly in section illustrating an embodiment of the invention, and a Figure 2 is an enlarged detail sectional elevation of the back head and the water tube parts. 1

Referring to the drawings, A represents a rock drill cylinder in which is arranged a reciprocatory piston B, only the front end of which is shown. A back head G forms a closure for thercarward end of the cylinder A. A front cylinder extension D forms a closure for the front end. of the cylinder and supports at its front end a front head E. Within the front cylinder extension D and the front head E is a chuck F, the front end of which is provided with internal screw threads G to receive a correspondingly threaded chuck jaw H. In this instance the chuck jaw H is provided with diametrically opposed longitudinal slots J, the sides of which cooperate with wings K of a drill steel L extending into the front head for preventing relative rotation between the drill steel and the chuck jaw H.

Interposed slidably in the chuck F and between the piston B and the drill steel L is an anvil block O the blows for transmitting of the piston to the drill steel. Seated on the cylinder A is a valve chest P in which is d1sposed a suitable distributing valve (not shown) for controlling the admission of pressure fluid to the cylinder to actuate the iston lit tench pressure fluid ma be conveys from suitable source of sappy by a cunnectiun and closely CONNECTION.

1926. Serial No. 122,638.

chest and the admis- V In certain types of rock drills such as that illustrated in the drawing, provision is usually made for conveying cleansing liquid from the back head through the cylinder and the reciprocatory parts into the hollow drill steel L for cleansing ingly, in the present instance, a longitudinal recess S is formed in the back head G and a smaller bore T is formed in the back head coaxially with the recess S to receive a water tube U having a reduced forward end V which extends into the hollow bore of the drill steel L. A flat end wall WV of the recess S forms a seat for a bulb X formed near the rearward end of the water tubeU and also fora packing member Y, preferably of rubencircles the end of the tube U fits the walls of the recess S.

Disposed slidably in the recess S is a bushing Z having a central bore Z) to receive the end of the water tube U. The bushing Zis seated on the packing member Y and has an annular groove her, which a which communicates with the bore 72 through radial passages cl for conveying water to the tube, such Water in the present instance being supplied to the recess S by a connection a leading from a source of supply and through a passage f in the back head communicating with the annular groove 0. Seated on the rearward end of the bushing Z is a packing member 9 for preventing leakage of water through the outer end of the recess S. This packing member g is preferably of the same size and form as the packing member Y and is provided with a central aperture it through which extends a forward extension 7' of a compression plug 70. The extension j of the compression plug is preferably substantially of the same diameter as the water plug U and is of length to permit the end thereof to extend slidably into the bore of the bushing Z. A flange 0 of the compression plug 7:: is adapted to fit slidably the recess S and is seated on the rearward end ofthe packing member 9, thus preventing rotation of said packing member with a water plug p screwed into a threaded portion g o the s it for compressing ti "t ifling i and a reset;

the drill hole. Accordrearward extension 1 of the compression plug 70 extends shdably into a recess s of the water 7 plug 12 to centralize the compression plug in the recess S.

The threaded portion'of the water plug 2 is preferably of such length that a considerable portion thereof extends rearwardly of the back head C to enable-a lock nut a to be screwed thereon for locking the water plug securely in position.

By means of the foregoing described in vention, leakage of water from the recess S into the cylinder A and from the rearward end of said recess is entirely eliminated. The parts comprising the connection are few in number, they are of simple and'inexpensive construction, the packing members Y and g and the bushing Z are reversible so that little attention is required-as to their proper position inthe-recess S when these parts are assembled in the back head.

1 I claim:

1. In a rock drill, the combination of a cylinder, at back head for the cylinder having a recess, a water tube in the cylinder extending-into the recess, a packing member in the end of the recess encircling the water tube to prevent leakage of water into the cylinder, means slidable in the recess to receive the end of the ater tube'and to convey water to said tube, a packing member seated on saidmeans for preventing leakage of water from the recess, a water plug for compressing the packings and holding the water tube against endwise movement, and a compression plug between the last said packing member and the water plug forming a seating surface for the water plug.

2. In a rock drill, the combination of a cylinder, a back head for the cylinder, a threaded recess in the back head having a flat end wall, a water tube in the cylinder extending with one end into the recess, a bulb on the tube seating on the end wall, a packing member abutting the end wall and en circling the water tube to prevent; leakage of Water into the cylinder, at bushing slidable in the recess to receive the end ot the water tube, said bushing having passages for conveying water to the tube, a packing member seated on the bushing to prevent leakage ot water from the recess, a water plug screwed into the recess for compressing the peeking members, a compression plug extending into the last said packing member and into the water plug, and a flange on the compression plug interposed bet-ween the last said packing and the water plug to prevent the trausinission of the rotary movement of the water pl ug to the packing during the threading of the water plug into the recess.

In testimony whereof I have signed this specification.

RUSSELL H. VILHELM. 

